Мой коментар:
Сред природат, но защо с цимент, и то толкова много? Дори покривът е циментен, дворът е циментиран...Реклама на цимент ли е?
Самата девойка изглежда доста нещастна, особено към края на видеото. Може би много изморена? Направо меч човешки усилия от нема страна изглеждат. И защо прави това съвсем това, с се пише много пъти като зрителите й се възхищавали Ив хвали? Не се казва за колко време е постъпила това..
Доста на е реалистично видео изглежда. Подозирам дори, че може да е замесен ИИ тук.
Но е полезно за как се строят каменни стени.
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УИ отговор на мой въпрос:
"Yes, absolutely. Ecological mortars without cement (specifically, without Ordinary Portland Cement or OPC) are not only possible but are a historically proven and increasingly popular sustainable alternative in construction and restoration.
The most common and well-established alternative is Lime Mortar.
🌿 Lime Mortar: The Cement-Free Ecological Choice
Lime-based mortars use lime (usually calcined limestone) as the binder instead of OPC. They have several ecological and structural advantages:
* Lower Carbon Footprint: The production of lime requires lower firing temperatures than cement, resulting in less energy consumption and lower initial \text{CO}_2 emissions.
* Carbon Sequestration: Lime mortars set by a process called carbonation, where the calcium hydroxide in the mortar reacts with \text{CO}_2 from the air, slowly turning back into calcium carbonate (limestone). Over its lifespan, lime mortar re-absorbs a significant portion of the \text{CO}_2 released during its production, often making it nearly carbon neutral.
* Breathability: Lime mortar is highly vapor-permeable, meaning it allows moisture to escape from walls. This "breathability" prevents dampness, condensation, and mold growth, contributing to a healthier indoor environment and protecting the building materials.
* Flexibility and Preservation: Lime mortar is softer and more flexible than cement mortar, allowing it to accommodate minor movements in the structure without cracking. This is crucial for the preservation of historic and traditional masonry structures.
* Reusability: Lime mortar can be crushed and reused at the end of a building's life, supporting the circular economy.
Types of Lime Mortar Binders
There are two main types of lime used as cement-free binders:
* Non-Hydraulic Lime (NHL):
* Made from pure limestone.
* Cures slowly by carbonation (reaction with \text{CO}_2 in the air).
* Best for sheltered, dry, or interior environments, and for conservation work.
* Natural Hydraulic Lime (NHL):
* Made from impure limestone that naturally contains silica and alumina.
* Cures by both hydration (setting with water, like cement) and slower carbonation (with air).
* The "hydraulic" properties allow it to set quicker and be more durable, making it suitable for exterior use, damp environments, and new construction. The strength is graded (e.g., \text{NHL 2}, \text{NHL 3.5}, \text{NHL 5}).
Other Alternative Binders
Beyond lime, other binders can be used, often with additives known as pozzolanas (like volcanic ash, calcined clay, or fly ash) to improve strength and water resistance:
* Geopolymer or Alkali-Activated Materials (AAM): These are cement-free binders that use industrial by-products (like blast furnace slag and fly ash) activated with an alkali solution. They can achieve high performance with a significantly reduced embodied carbon footprint.
Would you like to know more about the embodied carbon differences between cement and lime mortar, or where to source NHL for a specific project?"
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